Elastic-fluid turbine.



0. JUNGGREN. ELAS'I I6 FLUID TURBINE. APPLICATION FILED DEC- !L 1916.

1,253,834, Patented J an. 15, 1918,

l'rwventor: OscaFJun gran,

by Q

HisJqtLor-neg.

UNITED STATES PATENT 0FFICE.-

OSCAR JUNGGREN, 0E SGHENECTADY, NEW YORK, ABSIGNOB TD OENEBAL m0 COMPANY, A CORPORATION 01' NEW YORK.

ELASTIC-FLUID runnmn.

seq-$53,834.

Specification of Letter-l Patent.

To all whom it may concern:

Be it known that I, OSCAR Jusoonun, a citizen of the United States, residin at Schenectady, county of'schenectady, tate of New York, hnveinventcd certain new and useful Improvements in Elastic-Fluid Turbines, of which the following is a specification.

The present invention relates to elastic fluid turbines of the axial flow type, and particularly to an improved arrangement for staying or bracing the buckets of such turbines.

In the later stages of necessary to employ long buckets in order to obtain proper passage for the elastic fluid, the volume of which becomes very large. For example, in some instances the buckets may be 30 inches or more in length. With such long buckets there is a tendency for the buckets to bend under load in the direction of rotation, which bending is serious us it tends to produce a bending action on the bucket covers which may eventually such turbines it is cause them to break. Ditliculty is also experienced with long buckets due to their v1- brating.

The object of the present invention is to rovide an improved arrangement for staymg or bracing the buckets between their ends which will overcome the above referred to diliiculties. 1

According to my invention 1 provide diagonally extending stays, as wires or rods, each of which extends across the edges of a group of buckets. These stays may be on only one side or on both sides as found desirable, and they are fastened in notches or recesses in the edges of the buckets, as, for example, by welding, brazing, stay is so arranged that it extends entirely across its own group of buckets and overlaps on to the roup on each side. In other words, the en s of the stays overlap each other. This ties the respective groups to gether. The bucket cover is made in sections, as is well known, and the stays ere preferably so arranged that the breaks in the bucket cover occur at points about midway between the ends of the stays: The function of these braces or stays is to take up the torque and thereby.- prevent each group of buckets from moving. At the I isimie time they prevent ibrations of the or soldering", Each individua'l buckets, and also since they ovorin they want on group vibration. En the diit ing, Ei gure 1 is aview in side Fi 2 1S nfisection taken on line 2--2, Fig.1l 1' eferriti'g t0 the-drawing, 5 indicates-n turbine wgjeel to the Iriphery of which are attached t mey be attached to the wheel rim in -lny suitable manner, es for example, by the dove-tail arrangement indicated at 7 in Fig. 2. 8 indico'tes the bucket cover which is formed in sections and is riveted to the bucket ends b means of tenons formed in- =tegrel with t e buckets, as is wellknown. 9 indicates the stays which extend dingo pally across the buckets, the some being set into notches- 10 in the bucketed as indicated in Fig. 2. Thesestnys iiride the buckets into groups, and in the resent instance, a stay is s own on each side of each group. The direction of rotation of the turbine wheel is indicated by the arrow in Fig. 1 and the stays preferably extend diag- ,onally from the w eel rim toward the "bucket cover in the direction of rotation so that such stays are put under tension in holding the bucket As will be seen rom Fig. 1, the sta s overlap at their ends by an amount su eient to'efl'ectually tie the groups of buckets together. This prevents any group vibration. It will also be noted that the breaks between the bucket cover sections, as indicated at 11, occur about. midway of a sta and preferably, as shown, each sta extcn s fromabout the cenfier of one buc ct cover section to about the,'center of the next. This ties their ckets coinected to one cover section to tlie buckets connected to the cover section on each side thereof, thus preventing vibrations of the group of buckets connected with enycovm section.

The above dfifsci'ilnd'errangcmeut has the advantage the it is cheap and si fie to install and that "of buckin that it both prevents tlge'groum ets from moving under load'in the direction of rotation, and prevents the individual buckets or any groups thereof from vibratmg.

Patented Jan. "15, 191cc.

roups from moving.

it performed .doulde' function e turbine uckets 6. The buckets In accordance with the provisions of the patent statutes, I have described the prinei le of operation of my invention, together wlth the apparatus which I now consider to represent the best embodiment thereof; but I desireto have it understood that the apparatus shown is only illustrative'and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is 2- 1. In an axial flow tu'rbine, the combination of a shaft, a rotor thereon located in a lane at right angles to the shaft and havmg radially extending buckets thereon, a cover for the buckets, and diagonally extending stays extending across the edges of the buckets and fastened thereto, said stays dividing the buckets into groups and serving to prevent the groups from moving in the direction of rotation when under load, and also to prevent vibrations of the buckets.

2. In an axial flow turbine, the combination with a rotor having buckets thereon and provided with a bucket cover divided into sections, of diagonally extending stays extending across the edges of the buckets cover section to a point beneath the next one 4. In an axial flow turbine, the combination with a rotor having buckets thereon and provided with a bucket cover divided into sections, of diagonally extending stays extending across the edges of the buckets and fastened thereto, each stay extending from a point beneath one bucket cover section to a point beneath the-next, said stays overlapping each other at their ends.

In witness whereof, I have hereunto set. my hand this 7th day of December 1916.

OSCAR JUNGGRRN.

with a bucket cover divided of diagonally extending stays 

